/*
 * %W% %E%
 *
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
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 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
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 * Neither the name of Oracle or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
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 * You acknowledge that this software is not designed, licensed or intended
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/*
 * %W% %E%
 */

package java2d.demos.Paint;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.MultipleGradientPaint.CycleMethod;
import java.awt.Paint;
import java.awt.RadialGradientPaint;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Point2D;
import java2d.AnimatingControlsSurface;
import java2d.CustomControls;

import javax.swing.JComboBox;

/**
 * GradientPaint animation.
 */
@SuppressWarnings("serial")
public class GradAnim extends AnimatingControlsSurface {

	private static final int BASIC_GRADIENT = 0;
	private static final int LINEAR_GRADIENT = 1;
	private static final int RADIAL_GRADIENT = 2;
	private static final int FOCUS_GRADIENT = 3;

	private static final int MAX_HUE = 256 * 6;
	private final animval x1, y1, x2, y2;
	private int hue = (int) (Math.random() * MAX_HUE);
	private int gradientType;

	public GradAnim() {
		setBackground(Color.white);
		setControls(new Component[] { new DemoControls(this) });
		x1 = new animval(0, 300, 2, 10);
		y1 = new animval(0, 300, 2, 10);
		x2 = new animval(0, 300, 2, 10);
		y2 = new animval(0, 300, 2, 10);
		gradientType = BASIC_GRADIENT;
	}

	@Override
	public void reset(int w, int h) {
		x1.newlimits(0, w);
		y1.newlimits(0, h);
		x2.newlimits(0, w);
		y2.newlimits(0, h);
	}

	@Override
	public void step(int w, int h) {
		x1.anim();
		y1.anim();
		x2.anim();
		y2.anim();
		hue = (hue + (int) (Math.random() * 10)) % MAX_HUE;
	}

	public static Color getColor(int hue) {
		int leg = (hue / 256) % 6;
		int step = (hue % 256) * 2;
		int falling = (step < 256) ? 255 : 511 - step;
		int rising = (step < 256) ? step : 255;
		int r, g, b;
		r = g = b = 0;
		switch (leg) {
		case 0:
			r = 255;
			break;
		case 1:
			r = falling;
			g = rising;
			break;
		case 2:
			g = 255;
			break;
		case 3:
			g = falling;
			b = rising;
			break;
		case 4:
			b = 255;
			break;
		case 5:
			b = falling;
			r = rising;
			break;
		}
		return new Color(r, g, b);
	}

	@Override
	public void render(int w, int h, Graphics2D g2) {
		float fx1 = x1.getFlt();
		float fy1 = y1.getFlt();
		float fx2 = x2.getFlt();
		float fy2 = y2.getFlt();

		if ((fx1 == fx2) && (fy1 == fy2)) {
			// just to prevent the points from being coincident
			fx2++;
			fy2++;
		}

		Color c1 = getColor(hue);
		Color c2 = getColor(hue + 256 * 3);
		Paint gp;

		switch (gradientType) {
		case BASIC_GRADIENT:
		default:
			gp = new GradientPaint(fx1, fy1, c1, fx2, fy2, c2, true);
			break;
		case LINEAR_GRADIENT: {
			float[] fractions = new float[] { 0.0f, 0.2f, 1.0f };
			Color c3 = getColor(hue + 256 * 2);
			Color[] colors = new Color[] { c1, c2, c3 };
			gp = new LinearGradientPaint(fx1, fy1, fx2, fy2, fractions, colors,
					CycleMethod.REFLECT);
		}
			break;

		case RADIAL_GRADIENT: {
			float[] fractions = { 0.0f, 0.2f, 0.8f, 1.0f };
			Color c3 = getColor(hue + 256 * 2);
			Color c4 = getColor(hue + 256 * 4);
			Color[] colors = new Color[] { c1, c2, c3, c4 };
			float radius = (float) Point2D.distance(fx1, fy1, fx2, fy2);
			gp = new RadialGradientPaint(fx1, fy1, radius, fractions, colors,
					CycleMethod.REFLECT);
		}
			break;

		case FOCUS_GRADIENT: {
			float[] fractions = { 0.0f, 0.2f, 0.8f, 1.0f };
			Color c3 = getColor(hue + 256 * 4);
			Color c4 = getColor(hue + 256 * 2);
			Color[] colors = new Color[] { c1, c2, c3, c4 };
			float radius = (float) Point2D.distance(fx1, fy1, fx2, fy2);
			float max = Math.max(w, h);
			// This function will map the smallest radius to
			// max/10 when the points are next to each other,
			// max when the points are max distance apart,
			// and >max when they are further apart (in which
			// case the focus clipping code in RGP will clip
			// the focus to be inside the radius).
			radius = max * (((radius / max) * 0.9f) + 0.1f);
			gp = new RadialGradientPaint(fx2, fy2, radius, fx1, fy1, fractions,
					colors, CycleMethod.REPEAT);
		}
			break;
		}
		g2.setPaint(gp);
		g2.fillRect(0, 0, w, h);
		g2.setColor(Color.yellow);
		g2.drawLine(x1.getInt(), y1.getInt(), x2.getInt(), y2.getInt());
	}

	public class animval {
		float curval;
		float lowval;
		float highval;
		float currate;
		float lowrate;
		float highrate;

		public animval(int lowval, int highval, int lowrate, int highrate) {
			this.lowval = lowval;
			this.highval = highval;
			this.lowrate = lowrate;
			this.highrate = highrate;
			this.curval = randval(lowval, highval);
			this.currate = randval(lowrate, highrate);
		}

		public float randval(float low, float high) {
			return (float) (low + Math.random() * (high - low));
		}

		public float getFlt() {
			return curval;
		}

		public int getInt() {
			return (int) curval;
		}

		public void anim() {
			curval += currate;
			clip();
		}

		public void clip() {
			if (curval > highval) {
				curval = highval - (curval - highval);
				if (curval < lowval) {
					curval = highval;
				}
				currate = -randval(lowrate, highrate);
			} else if (curval < lowval) {
				curval = lowval + (lowval - curval);
				if (curval > highval) {
					curval = lowval;
				}
				currate = randval(lowrate, highrate);
			}
		}

		public void newlimits(int lowval, int highval) {
			this.lowval = lowval;
			this.highval = highval;
			clip();
		}
	}

	public static void main(String argv[]) {
		createDemoFrame(new GradAnim());
	}

	class DemoControls extends CustomControls implements ActionListener {

		GradAnim demo;
		JComboBox combo;

		public DemoControls(GradAnim demo) {
			super(demo.name);
			this.demo = demo;
			combo = new JComboBox();
			combo.addActionListener(this);
			combo.addItem("2-color GradientPaint");
			combo.addItem("3-color LinearGradientPaint");
			combo.addItem("4-color RadialGradientPaint");
			combo.addItem("4-color RadialGradientPaint with focus");
			combo.setSelectedIndex(0);
			add(combo);
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			int index = combo.getSelectedIndex();
			if (index >= 0) {
				demo.gradientType = index;
			}
			if (demo.animating.thread == null) {
				demo.repaint();
			}
		}

		@Override
		public Dimension getPreferredSize() {
			return new Dimension(200, 41);
		}

		@Override
		public void run() {
			Thread me = Thread.currentThread();
			while (thread == me) {
				for (int i = 0; i < combo.getItemCount(); i++) {
					combo.setSelectedIndex(i);
					try {
						thread.sleep(4444);
					} catch (InterruptedException e) {
						return;
					}
				}
			}
			thread = null;
		}
	}
}
